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Patented May 20, 1890.

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BURGLAR PROOF SAFE.

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THE Nunms ver: co www Lmm wAsnlNnYoN n c invented certain new and useful Improveets--a method adopted on account of the non- .the safe-door as seen from within.

UNITED STATES CHARLES 4O. YALE, OF NEV YORK, N. Y.

BU RG LAR-PROOF SAFE.

SPECIFICATION forming part of Letters Patent No. 428,240, dated May 2o, 1890.

Application filed March 9, 1889. Serial No. 302,688. (No model.)

To all whom, it may concern.-

Be it known that I, CHARLES O. YALE, of the city, eounty,and State of New York, have ments in Burglar-Proof Safesavhereof the following is a specification.

The improvements are directed to the structure of the walls, the door, and the locking bolt work of the door, with the object of enhancing the power of resistance to explosives ignited from within the safe. The force of such explosion is mainly against the door, and the tendency is to bulge out the Walls, rendering them susceptible to oth er modes of attack, and to tear off the bolt-work of the door, or loosen its anchorage therefrom.

Heretofore the laminae of which the walls and the body of the door are constructedconsisting, for instance, of cast 1netal,as franklinite, wrought-iron, and welded steel and iron, (called homogeneous Steeb-have been secured to each other by screw-bolts and rivwelding'nature of the contiguous surfaces of the wrought steel or iron next to the cast metal. Such method of joining is imperfect, as it is impossible to bring all parts thereof into immediate contact with each other on account of the unevenness of the adjoining surfaces, so that the seams are more or less open, and, moreover, the bolt-work frame on the inner side of the door secured in the same manner is liable to be torn away. According to myinvention an intimate union is formed between the adjoining surfaces of the non-welding metals, the seams are thoroughly closed throughout, the whole conglomerate Wall (or door) is made a solid mass of metal, and the bolt-work is permanently secured to the door.

To enable others skilled in the art to practice my invention, I have shown in the annexed drawings the door of a burglar-proof safe embodying my said improvements, and also sectionsor parts of the wall or door, illustrating the structure thereof.

Figure l in said drawings is a face view of Fig. 2 is an edge view of the door, showing the inner face-plaie and boltwork frame in section. Fig. 3 is a section of the door or wall, showing the different layers of metal as united.

Fig. 4 shows part of a slab of the cast metal or franklinite as prepared with wrought bars cast therein before dressing off.

'A is the faceplate of the door. A is the frame around the margin of said p1ate,which holds the locking-bolts B of the door.

. C is the usual disk, connected with the knob Without, lfor throwing the several bolts at once, as by connection therewith by links D or otherwise.

In carrying my invention into practice I rst prepare slabs of franklinite E, with bars of wrought-,iron F cast therein, so as to leave av protruding surface, the bars being made wedge form in cross-section, as shown, so as to be held securely in the cast metal E. A row of these bars is cast into each side of the slab E, and at right angles one to the other, as indicated by the full and dotted lines in Fig. 4. These slabs with the wrought bars therein are placed in a suitable machine and the bars dressed down to the level about of the slab. Having thus obtained wroughtmetal surfaces, I take the plates of welded iron and steel, and having well cleansed the surface (as by immersion in acid solution or otherwise) the plates are laid on the slab of franklinite, arranged transversely to the wrought bars therein, and a fusible coherent metal or alloy placed between with a proper iluX. The whole is then placed in a furnace and brought to. a temperature sufficient to fuse and melt the interposed metal or alloy, whereby the seams are all filled and the said plates caused to cohere to the franklinite slab through the agency of the wrought-iron bars therein, to the surface of which bars such plates are thus united. A plate of wroughtiron G is usually united to the opposite side of the franklinite slab at the same time and in substantially the same way.

In making up the safe-door on this plan of union I first take the Wrought-iron plate that is to form the inside face-plate A and join the bolt-work frame A thereto, preferably by forging and welding t-he two together, so as to form one solidpiece. I then make a pile composed of all the plates of all the metals of which the door is composed, with the outside plate of the. door downward, and then lay on top of all, temporarily fastened in place,

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the plate and frame A, which is to hold the looking-bolts of the door. The entire pile is then placed in the furnace,witli the coherent metal introduced in all the seams, as before set forth, and the whole converted by heat into one solid mass.

I claim as my invention- 1. The improvement in laminated walls of burglar-proof safes and safe-doors, consisting in forming an intimate union between the several laminaeJ composing the wall, which consists in fusing an interposed coherent metal between them, as set forth,whereby the whole is converted into a solid body, substantially as described.

2. The method of forminga union between a slab of cast metal, as franklinite, and a layer of wrought iron or steel by casting bars of Wrought meta in the franklinite, so as to leave a protruding surface, dressing down the exposed surface of wrought-iron about on a level with the cast metal, and then uniting the layer of steel or iron to the exposed wrought bars in the franklinite by the interposition of a coherent metal, as specied.

3. In a metallic wall composed in part of fran klinite or like cast metal having wroughtinetal bars cast therein, so as to protrude from the surfaces, the arrangement of said bars on opposite sides of the franklinite at right angles to each other.

4. A laminated metallic wall for burglarproof safes, comprising layers of Wroughtiron, franklinite, and welded steel and iron plates united by means of an interposed coherent metal, substantially as described.

5. In a burglar-proof safe-door comprising layers of franklinite, steel, and iron, the combination of the inner face-plate formed integrally With the boltwork frame and suoli `frame and face-plate united integrally with the door, as set forth.

CHARLES O. YALE. Witnesses:

JAMES M. TULLY, JONATHAN MARSHALL. 

